The bard in the Pathfinder group I'm in has a spell "Summon Instrument". However, we learned that its only for handheld instruments and we REALLY wanted to do a piano drop, so I picked a potion [Being an Investigator, or Rogue/Alchemist hybrid] that increased strength enough so that a smaller piano of 300 pounds could be lifted off the ground, which the Dungeonmaster decided counted as handheld. However, our bard isn't the character that can hold piano over head, so to make things more complicated, after having a potion given to the bard to summon the piano the bard then has to give the piano to another character to throw [She could still drop it straight from the top of a roof without the last step, though]. The plan is really convoluted, but dropping pianos on enemies is worth it.
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